#include<stdio.h>
int china(int* a);
/*
 * int a ;
 * a = b;
 * a = 9;
 */
/*
 * 指针
 * &b 取b的地址
 * a b的地址
 * *a 取b对应地址的值
 * *a = 9
 */
int main()
{
	int b = 4;
	china(&b);
	printf("b = %d\n",b);
	return 0;

}
int china(int* a ){

 	*a = 9;
}
